"Whoever does righteousness - it is for his [own] soul; and whoever does evil [does so] against it. And your Lord is not ever unjust to [His] servants." Verse 46, Surat Fussilat, Chapter 24
Hadith
"Every Ummah (people) has a test to undergo, my Ummah will be tried through the wealth." Source: Sunan at-Tirmizi